<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width=" isCollapse ? '64px' : '200px'">
          <div class="toggle-button" @click="toggleCollapse">|||</div>
          <!-- 侧边栏菜单区域 -->
            <el-menu background-color="#323744" text-color="#fff" active-text-color="#409EFF"
            unique-opened :collapse="isCollapse" :collapse-transition="false"
            router :default-active="activePath">
              <!-- 一级菜单 -->
              <el-submenu :index="item.id + ''" v-for=" item in menuList" :key="item.id">
                <!-- 一级菜单的模板区域 -->
                <template slot="title">
                  <!-- 图标 -->
                  <i :class="iconsObjs[item.id]"></i>
                  <!-- 文本 -->
                  <span>{{ item.authName }}</span>
                </template>
                <!-- 二级菜单 -->
                <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children"
                :key="subItem.id" @click="saveNavState('/' + subItem.path)">
                   <!-- 二级菜单的模板区域 -->
                  <template slot="title">
                    <!-- 图标 -->
                    <i class="el-icon-menu"></i>
                    <!-- 文本 -->
                    <span>{{ subItem.authName }}</span>
                  </template>
                </el-menu-item>
              </el-submenu>
            </el-menu>
      </el-aside>
      <!-- 右侧内容主题 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  created () {
    // 获取侧边栏菜单的列表数据(需要在created生命周期函数中调用)
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  data () {
    return {
      // 左侧菜单数据
      menuList: [],
      // 图标的映射表 id => icon-name
      iconsObjs: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 菜单是否折叠
      isCollapse: false,
      // 激活的连接地址
      activePath: ''
    }
  },
  methods: {
    logout () {
      // 清空token
      window.sessionStorage.clear()
      // 跳转到登录页
      this.$router.push('/Login')
    },
    // 获取所有的菜单
    async getMenuList () {
      //  const { data: res } = await this.$http.post('login', this.loginForm)
      const { data: res } = await this.$http.get('menus')
      console.log(res)
      // 若获取菜单失败，则打印错误消息
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.menuList = res.data
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373c41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}

.el-aside {
  background-color: #323744;
  .el-menu {
    border-right: none;
  }
}

.el-main {
  background-color: #eaedf2;
}

.iconfont {
  margin-right: 10px;
}

.toggle-button {
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
